Book review : Entrepreneurship in emerging regions around the world : theory, evidence and implications

P.H. Phan, S. Venkataraman and S.R. Velamuri (2008) Entrepreneurship in emerging regions around the world: Theory, evidence and implications, Edward Elgar, Cheltenham, United Kingdom

A study of older Australians’ volunteering and quality of life : empirical evidence and policy implications

Older Australians are confronted by dramatic changes in their physical, social, financial, and psychological well-being. There are social costs to these changes related to their productivity and increased costs associated with caring for older Australians. Greater community engagement through voluntary work practice may minimize these costs, as well as positively influence volunteers' subjective quality of life (QOL). This study investigates the motivations for older Australians to engage in formal voluntary work. It seeks to identify whether the motivational factors to volunteer are associated with individuals' subjective QOL. The results indicate a positive relationship between older people's motivations to volunteer and their subjective QOL. This association is strengthened by respondents' community orientation, positive perception of voluntary work, positive personal attitudes toward volunteering, and their self-esteem. The role of policy makers in motivating larger participation by the older groups is discussed.

Academics,think tanks and journalists : the trouble with expert opinion, empirical evidence and bilingual education

This book reports the findings of the Australian News media and Indigenous policymaking 1988-2008 ARC Discovery Project

Growth in literacy and numeracy achievement : evidence and explanations of a summer slowdown in low socio-economic schools

The phenomenon of summer slide or setback has gained a great deal of attention in the USA. It is understood to account for as much as 80 % of the difference in achievement for students between low and high socio-economic families over their elementary schooling. In a mixed method longitudinal study of reforms in low socio-economic school communities in Victoria, Australia this phenomenon in the achievement growth of primary and secondary school students for both literacy and numeracy was identified. The longitudinal analysis of achievement data revealed decelerated growth during Terms 4 and 1, the spring and summer months in the Australian school calendar. In this article we present these findings and the reflections of Principals, literacy and numeracy leaders and coaches about these findings and their suggestions for action. We argue that reforming school practices during Terms 1 and 4 and developing a deeper understanding of students’ out-of-school learning and knowledge are essential for enhancing growth in achievement from September to March and for narrowing the achievement gap between marginalised and advantaged students. Further research of this phenomenon in the Australian context is needed.

Heat for nothing or activity for free? Evidence and implications of activity-thermoregulatory heat substitution

If heat generated through activity can substitute for heat required for thermoregulation, then activity in cold environments may be energetically free for endotherms. Although the possibility of activity-thermoregulatory heat substitution has been long recognized, its empirical generality and ecological implications remain unclear. We combine a review of the literature and a model of heat exchange to explore the generality of activity-thermoregulatory heat substitution, to assess the extent to which substitution is likely to vary with body size and ambient temperature, and to examine some potential macroecological implications. A majority of the 51 studies we located showed evidence of activity-thermoregulatory heat substitution (35 of 51 studies), with 28 of 32 species examined characterized by substitution in one or more study. Among studies that did detect substitution, the average magnitude of substitution was 57%, but its occurrence and extent varied taxonomically, allometrically, and with ambient temperature. Modeling of heat production and dissipation suggests that large birds and mammals, engaged in intense activity and exposed to relatively warm conditions, have more scope for substitution than do smaller endotherms engaged in less intense activity and experiencing cooler conditions. However, ambient temperature has to be less than the lower critical temperature (the lower bound of the thermal neutral zone) for activity-thermoregulatory heat substitution to occur and this threshold is lower in large endotherms than in small endotherms. Thus, in nature, substitution is most likely to be observed in intermediate-sized birds and mammals experiencing intermediate ambient temperatures. Activity-thermoregulatory heat substitution may be an important determinant of the activity patterns and metabolic ecology of endotherms. For example, a pattern of widely varying field metabolic rates (FMR) at low latitudes that converges to higher and less variable FMR at high latitudes has been interpreted as suggesting that warm environments at low latitudes allow a greater variety of feasible metabolic niches than do cool, high-latitude environments. However, activity-thermoregulatory heat substitution will generate this pattern of latitudinal FMR variation even if endotherms from cold and warm climates are metabolically and behaviorally identical, because the metabolic rates of resting and active animals are more similar in cold than in warm environments. Activity-thermoregulatory heat substitution is an understudied aspect of endotherm thermal biology that is apt to be a major influence on the physiological, behavioral and ecological responses of free-ranging endotherms to variation in temperature.

Programs to improve interpersonal safety in Indigenous communities: evidence and issues

There is now a substantial amount of published literature describing the range of programs and interventions that have been implemented in an attempt to improve aspects of community safety. Only a small body of this work, however, has examined the outcomes of those programs delivered to Indigenous Australians or, indeed, the communities in which they live. This Issues paper provides an overview of those programs that were identified in a systematic search of relevant research databases. 

Evidence and obesity prevention : developing evidence summaries to support decision making

Public health practitioners make decisions based on research evidence in combination with a variety of other influences. Evidence summaries are one of a range of knowledge translation options used to support evidence-informed decision making. The literature relevant to obesity prevention requires synthesis for it to be accessible and relevant to end-users. As part of a national collaboration on obesity prevention, we used a stakeholder-focused approach combined with transparent review methods to develop evidence summaries covering a selection of topics relevant to policy and practice in the context of childhood obesity prevention.

Is fat the sixth taste primary? Evidence and implications

Taste is the chemical sense responsible for the detection of non-volatile chemicals in potential foods. For fat to be considered as one of the taste primaries in humans, certain criteria must be met including: class of affective stimuli; receptors specific for the class of stimuli on taste bud cells (TBC); afferent fibers from TBC to taste processing regions of the brain; perception independent of other taste qualities; and downstream physiological effects. The breakdown products of the macronutrients carbohydrates (sugars) and protein (amino acids) are responsible for activation of sweet and umami tastes respectively. Following the same logic the breakdown products of fat being fatty acids are the likely class of stimuli for fat taste. Indeed, psychophysical studies have confirmed fatty acids of varying chain length and saturation are orally detectable by humans. The most likely fatty acid receptor candidates located on TBC are CD36, G protein-coupled receptor 120. Once the receptors are activated by fatty acids a series of transduction events occurs causing the release of neurotransmitters towards afferent fibers signalling the brain. Whether fatty acids elicit any direct perception independent of other taste qualities is still open to debate with only poorly defined perceptions for fatty acids reported. Others suggest that the fatty acid taste component is at detection threshold only and any perceptions are associated with either aroma or chemesthesis. It has also been established that oral exposure to fat via sham feeding stimulates increases blood triacylglycerol concentrations in humans. Therefore, overall, with the exception of an independent perception, there is consistent emerging evidence that fat is the sixth taste primary. The implications of fatty acid taste go further into health and obesity research with the gustatory detection of fats and their contributions to energy and fat intake receiving increasing attention. There appears to be a coordinated bodily response to fatty acids throughout the alimentary canal; those who are insensitive orally are also insensitive in the gastrointestinal tract and overconsume fatty food and energy. The likely mechanism linking fatty acid taste insensitivity with overweight and obesity is development of satiety after consumption of fatty foods.